(1) A man's age is three times his son's age. Ten years ago he was five times his son's age.
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Son's age x
Father age be x ten years ago son age x-10. Father age 3x-10. 5(x-10)=3x-10. 5x-50=3x-19. 2x=40,x=20and now 3x=60 at present son's age is 20 and father's age is 60
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